Electric machine brake



42192-2 2 sheets-'shew 1 June 8 1926. v E

4w. H. MORGAN ELECTRIC MACHINE BRAKE Fil'eq oct. e

June 8 192.6;

W. H. MORGAN ELECTRIC MACHINE BRAKE 2 Sheets-Sheet 2 Filed Oct.` 'f 1922 25' feel' attorneys Patented June 8, 1926.

UNITED ,STATES WILLIAM iiiiiviw` MORGAN, or ALLiANcngoHIo.

'ELECTRIC MACHINE BRAKE.

- -"App1icatio`n1ed October 6, 1922. Seria1,No. 592,728.

. .This .invention relates to improvements in electric machine brakes and ,more particularly to such as are spring-applied and magnetically releasedff-one object `of vthe :i inventionibeing to provide a simple self-Y Vcontained.bralre structure to beV supported upon the shaft, the rotation of whichit con,- trols; which shall require no holding-down boilts or Vshoeson the frame of themachine; i which will operate to control the v.rotation of the., shaft regardless rof. the direction ofV .rotation yof the latter, and in which the brake linings maybe readily renewed without necessity for dismembering the whole i structure.' 'Y 1 v l A Ifurther object isto lprovide a. simple electric brake structure in which both vre- Vvolvable.:and non-revolvable parts may be 1 :applied to afndvsupported' by the` standard short armature ishaft of an electric motor.,

whereby any wear .in the bearing supporting the isha-ft will not throw the parts of the brake AoutV of. alignment or adjustmen withregard .to each other. y Y, .furtlierobjectis to so construct a brake structure of the type mentioned that its opferation willbe. equally effective whether the shaft'jberotated in one direction ork the other. 3 Withthese and other objects Vin view, :the invention consists in certain novel features of construction and combinations of parts as .hereinafter Vset'f'orth and pointed out in the claims. In the accompanying drawings; Figure 1 is a sectional view on the line 1 1 of Figure 2 showing an embodiment of my invention; Figure 2 is a rear face view; F ig-,

ure 3 is a rear face view of the magnet frame; Figure 4 is a sectional view, 'showing the magnet 4frame Vand the-armature;

Figure is a fragmentary sectional view on the line 5-5 of Figure 2, and Figure 6 is a fragmentary sectional view of a portion' of one of the brake shoe wheels. f

' My improved brake structure is particularly well adaptedV for attachment to the hoist motors of Aelectric cranes and hoist-s'1 and said structure includes a hubl to be keyed or otherwise secured to the armature shaft of an electric motor. The hub 1 carries a circular brake shoe 27 theflatter being connected with the hub l, through the medi,- um of a circular series of spokes 3, prefer- V ably made V-shaped in cross section as indicated in Figure 6. The shoe is thus made inthe .forni of a spoked vwheel having an elongated-hub and these parts made in a single integral structiire,-the saidl shoe being located at one end of the hub. A @similar Y annular spoked shoe 4 provided with a hub 42L is locatedV on and lreyedto the other end of the hub 1, as indicated at 5. An electro-magnet frame 6 encircles `the hujb 1 (which carries thebralie shoes 2 4),

yand. lilas vpressed therein, a bushing Y in'` `which said ,hubv rotates, said magnet frame being capable of limited endwise movement relatively'gto said hub.` LThe magnet coil 8. which latter may be of yround insulated wire or it may befof insulated copperribbonfsaid coil being enclosed'in a suitable envelope 9 of insulating material and' retained in position within .the magnet frame by a nonmagnetic plate or closure 10. An annular armature frame 1l for the magnet encircles the hub l and lis `formed with facesv 1,2-12 disposed opposite the` pole faces of the mag- Inet,4 and` to vsaid armature abralre lining 13 is ,-secuife,d. said .brake liningl being posi'- 2. ,A fsteel'plate or ring 14 is .secured to the magnet frame 4(5 yby Abolts 15 and carries a .brake lining 16 for .cooperation with the brake slice 4. .The brake linings 13 and 16 vtionary part of a crane oi" other apparatus',

to prevent the magnet frame and its arma-` ture from turning. a

' Compression springs 21 are disposed bef tween the magnet frame 6l and the armature 11 and serve normally to press the brake linings against the brake shoes 2 and 4 carried by the motor armature shaft, in a man-v ner to apply braking action to the latter. In the embodiment of the invention shown in the drawing, eight compression springs are employed, (although a greater or less number may be used) and they are housed'in `tioiiediforcooperation with the brake shoe i tubular portions 22 near the peripheral portion of the magnet frame 6. These springs bear at one end against centering plugs 23 carried by the armature frame 11 and at their other ends against plug 24threaded f in the` portions V 22,--said last-mentioned Y luOs beinO- made withV a Wrench-engaging t: L1 Y D b b part 25, whereby they Vmay beadjusted to adjust the tension of the springs 21.

When the magnet coilV 8 is energized, the pull of the magnet will overcome the action of the series of compression springs 2l Vand draw the magnetframe 6 and the armature frame toward each other thereb withdrawn ,n c n 111.0 the non-revoluble friction brake linin u l n rings 13, 16 from pressure against the annular brake shoes 2 and L and permitting free rotation of the shaft, OpeningV of the circuit of the magnet coil will deenergize the magnet and permit the compression springs 28 to operate to apply the brake.

lhile I have described my improvements;

as applied to the armature Yshaft of an electric motor, they may if desired, be employed with a through shaft rdriven by gearing or otherwise from the revolvingv element of a motor. j f v My improved brake is so constructedl that i it can be applied to the standard short mo-v tor armature shaft extension. Both the `revolving and non-revolving parts of the brake structure being supported by the shaft, any

wear in the bearing supporting the shaft will not` throw the parts of the brake out of alignment or adjustment with regard to each other and does not require any holding-down bolts or Shoes on the frame of the machine. The brake structure is SelfcOntained; may be easily applied to a crane, hoistV or other apparatus and, with the exception of the anchor. rod or similar fastening means, the forces are all taken up within the brake structure andi/not transmitted to any other part of the machinery. Furthermore, the improved brake will operate equally Well with either direction of r0- tation ofthe shaft l. This is important in case `of a crane hoist as thebrake will not only holdl the load from lowering but will prevent the drifting of the hook block in the hoist direction. Y Y t Various changesmight-be made in the details of construction of my invention Withoutdeparting from the spirit of thelatter and Ido not 'wish' to,` restrict myself to the precise details herein set forth.

Having fully described my invention what I claim as new and desire to secure by Let-y l. ln an electric brake of the character de nular brake shoes rigid with respective ends of said hub, a magnet frame and an yarmature frame snpportedby said hub` between ,said brake shoes, a brake lining carried by the armature frame and cooperable with' one of said brake shoes, a brake liningcarried by the magnet frame andV cooper-able with the other brake shoe, compression springs be-V vshoes respectively, compression springs between' the magnet and armature frames, and

anchor means*` for preventing rotationv 0f said magnet and armature frames.

In testimony ,.whereof, I have ,signedth'is specification.V

WILLIAM HENRY MORGAN. y

V scribed, thejcombination with av hub, of 'an-V 

